Pre-heating combustion air

Eric

Hi,

I want to investigate the effect of pre-heating the combustion air to a burner. I'm doing this by simulating a system with an inlet velocity , calculated from a known mass flow rate, for stiochiometric conditions and then simulating the same system for stoichiometric conditions with the pre-heated combustion air.

If the air is pre-heated there is a density change that in turn causes an increase in velocity if the mass flow rate must remain the same, I'm sure this correct??

So how do you tell the difference between the effect the preheat has on the flow and the effect the increased velocity has on the flow?????

Or can the velocity be kept constant?? Please help really stuck!!

Regards,

Eric